When moving a retreived column, the gray column that I have not seen before appears.

VyNDEX has a hidden column as the working area.
When moving a column in Excel, the hidden column sometimes becomes unhidden.

<Example of an unhidden column>

[How to Resolve]
Click Pull to retrieve the data.
Note: The change made before retrieving is discarded.

When you want to change the order of columns, do not use Excel to move columns. Instead, use the column-shifting buttons at the right side of “Field Editor” screen to change the order of columns, and retrieve the data.

<Column-shifting Buttons>

(Updated on April 14th, 2016)